How to configure DMA2D to receive YCbCr MCU data as input using the STM32IDE ioc configurator

[LFerr.8]

I wish to decode the output of the JPEG accelerator using the DMA2D controller from YCbCr to RGB, as referenced here:

https://www.st.com/content/ccc/resource/training/technical/product_training/group0/d7/07/45/76/c2/f9/41/4f/STM32H7-Peripheral-JPEG_codec_JPEG/files/STM32H7-Peripheral-JPEG_codec_JPEG.pdf/_jcr_content/translations/en.STM32H7-Peripheral-JPEG_codec_JPEG.pdf

I am using an stm32h7 nucleo board. In the DMA2D configuration menu I have set transfer mode to "Memory to Memory with Pixel Format Conversion". My problem is that in the foreground layer configuration, the input color mode drop down menu does not show YCbCr as an option. Do I have to set it up manually or is there some other way to configure DMA2D for this use case? For manual setup, are there any extra steps I should consider other than simply replacing the input color mode field to YCbCr? Do I need to consider any changes to the pinout?

I have checked and in the source files there is a macro for YCbCr input mode.

[KDJEM.1]

Hello @LFerr.8 ,

Thank you for bringing this issue to our attention.

I Confirm the issue and I reported internally.

I recommend you to take a look at these examples:

• JPEG_DecodingFromFLASH_DMA: To decode and display a compressed JPEG image stored on the internal Flash memory using the hardware JPEG decoder in DMA model and the DMA2D for the YCbCr to RGB conversion.
• JPEG_EncodingFromFLASH_DMA: To encode an RGB image stored on the internal Flash memory using the hardware JPEG codec in DMA model and store the result compressed jpeg file to the SD Card memory. The RGB to YCbCr conversion (required prior to the encoding) is performed by the JPEG utility software.

May AN4996 help you.

Internal ticket number: 190654 (This is an internal tracking number and is not accessible or usable by customers).

Thank you.

Kaouthar